i think the 5 most important rules are 1. don't text and drive, texting while driving can be fatal 2. avoid texting during a face to face conversation, it's rude 3. turn off your ringer and dim your screen during a movie, no one wants to hear or see that 4. you should lower your voice when your talking on your cell phone in public, its rude, and people might not want to hear you scream 5. you should not look things up during a face to face conversation, because you cant focus on what that person is saying.